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1da177e4 LT |
1 | /* |
2 | * Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com | |
3 | * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can distribute it and/or modify it | |
6 | * under the terms of the GNU General Public License (Version 2) as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
17 | * | |
18 | * Routines corresponding to Linux kernel FP context | |
19 | * manipulation primitives for the Algorithmics MIPS | |
20 | * FPU Emulator | |
21 | */ | |
1da177e4 LT |
22 | #include <linux/sched.h> |
23 | #include <asm/processor.h> | |
24 | #include <asm/signal.h> | |
25 | #include <asm/uaccess.h> | |
26 | ||
27 | #include <asm/fpu_emulator.h> | |
28 | ||
1da177e4 LT |
29 | #define SIGNALLING_NAN 0x7ff800007ff80000LL |
30 | ||
31 | void fpu_emulator_init_fpu(void) | |
32 | { | |
33 | static int first = 1; | |
34 | int i; | |
35 | ||
36 | if (first) { | |
37 | first = 0; | |
38 | printk("Algorithmics/MIPS FPU Emulator v1.5\n"); | |
39 | } | |
40 | ||
eae89076 | 41 | current->thread.fpu.fcr31 = 0; |
1da177e4 | 42 | for (i = 0; i < 32; i++) { |
eae89076 | 43 | current->thread.fpu.fpr[i] = SIGNALLING_NAN; |
1da177e4 LT |
44 | } |
45 | } | |
46 | ||
47 | ||
48 | /* | |
49 | * Emulator context save/restore to/from a signal context | |
50 | * presumed to be on the user stack, and therefore accessed | |
51 | * with appropriate macros from uaccess.h | |
52 | */ | |
53 | ||
54 | int fpu_emulator_save_context(struct sigcontext *sc) | |
55 | { | |
56 | int i; | |
57 | int err = 0; | |
58 | ||
59 | for (i = 0; i < 32; i++) { | |
60 | err |= | |
eae89076 | 61 | __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 62 | } |
eae89076 | 63 | err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
64 | |
65 | return err; | |
66 | } | |
67 | ||
68 | int fpu_emulator_restore_context(struct sigcontext *sc) | |
69 | { | |
70 | int i; | |
71 | int err = 0; | |
72 | ||
73 | for (i = 0; i < 32; i++) { | |
74 | err |= | |
eae89076 | 75 | __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 76 | } |
eae89076 | 77 | err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
78 | |
79 | return err; | |
80 | } | |
81 | ||
875d43e7 | 82 | #ifdef CONFIG_64BIT |
1da177e4 LT |
83 | /* |
84 | * This is the o32 version | |
85 | */ | |
86 | ||
87 | int fpu_emulator_save_context32(struct sigcontext32 *sc) | |
88 | { | |
89 | int i; | |
90 | int err = 0; | |
91 | ||
92 | for (i = 0; i < 32; i+=2) { | |
93 | err |= | |
eae89076 | 94 | __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 95 | } |
eae89076 | 96 | err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
97 | |
98 | return err; | |
99 | } | |
100 | ||
101 | int fpu_emulator_restore_context32(struct sigcontext32 *sc) | |
102 | { | |
103 | int i; | |
104 | int err = 0; | |
105 | ||
106 | for (i = 0; i < 32; i+=2) { | |
107 | err |= | |
eae89076 | 108 | __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 109 | } |
eae89076 | 110 | err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
111 | |
112 | return err; | |
113 | } | |
114 | #endif |